Bionamng-circuits for toll lines



J. DAVIDSON, Ja. SQGNAHNG cmclms Fen TOLLLINES.

APPHCAHON FiL'il] 953.12.1918.

Patented Dec. 7, 1920.

4 S HEETS-SHEET l- N H m Vm m W T MA 0. J M

J. DAVIDSON, Ja.

StGNALING cmcuns FOR TOLL LINES.

APPLICAHON FILED DEC. 12, ISIB.

Patented D60. 7, 1920.

4 smznssn:n 2.

IHI- m6 =-I IHI E2:

:QQ A

il j i I N V EN TOR. dflawdyon, J:

ATTORNEY J. DAVIDSON, JR.

SIGNALING cmcuns FOR TOLL LINES APPUCATiON FILED DEC. 12. I918.

Patented Dec. 7, 1920.

4 SHEETS-SHEET 3.

I N V EN TOR. JDmzzdsom, J:

A TTORNEY --i ii ?}:3: fi 3 3 J. DAVIDSON, JR. SlGNALING CIRCUITS FOR TOLL UNES.

APPLICATION nun DH. :2. 1918.

1,361,024. Patented Dec. 7,1920.

4 SHEETS-SHEET 4.

INVENTOR.

A TTORNEY mm: DAVIDSON, cm. or monrcum, NEW. rnonn AND rnmenun GOHIAHY,

JEESEY, ASSIGNOR TO AMERICAN Thinn- A CQBROBATION OF NEW YORK.

SIGNALING-CIRCUITS FOR TOLL LINES.

Specification of Letters Patent.

Patented Dec. 7, 1920.

Application Med December I2, 1915. Serial No. 268,488.

To whom it "my COILCGIW.

Be it known that I. Join: lliivipson, Jr. residing at Montclair, in the county 0 Essex and State of New Jersey, have invented certain Im rovements in Signaling- Circuits for Toll lines, of which the following is a specification.

This invention relateato signaling circuits and more particularly to si nnling cir cuits for use in connection witi long distance tele hone lines.

Hereto ore it has been customary to provide for'eaeh toll line used for long distance connect-ion, a si maling path to he used for supervisory and other si made necessary in connection with the estalilishment of such connections. In order to reduce the expense involvemn such an arrangement, it has been proposed to. rovide a common signaling path for a p nralityof lines and surcessively connect said common path with local signalinp circuits individual to the lines ateach end thereof by means of a rotary distributor or equivalent device. i-\rrangonicnts of this character are dis olosed in United States Putrnts to linncroft (ilu-rardi, Nos. 1,251.3(53 and 1.251.364 granted December 25, 1917.

One oi the objects of tho n'cscnt inwiv tion is to improve and simplify the apparatus and system of the patents above r0- i'i-rred tin although other and further objects of the invention will be apparent from the deeiri'iption lu-rcinuiicr ,u'ivcu.

'lhcs'e objects are iu'roinplishod by using an intermittently operating distributor for scndincode signals over the t'UllJlLIUll path. each tiill lino ltlt\'ll\ u definite set of Halo ooi-nbimitions individual thereto. so that signals for a mrtirular toll line will he transmit-toil by the code combinations assigned to it.

Since the intermittently operating distrihnter transmits one signal for each opcr anon/thereof. lhc invention contemplates the pimvision-o'fsuitable moans fin-delaying the signalsof a plurality of toll lines. which may be simultaneously in signaling roi-ulitiomas well as means for determining the-order inwhirh. .ilunsigznals of .a, plvmality of lineq aretolmtmnsmittod. I'lhese functlOflSdtlfB. mwoiuplishml as .herein disclosed by 'moann of a um-anally r tating sw t h 'whirh'is-providcd with a set ofcode contacts'f cr each combination of each toll line the toll line L coming and ofthc toll and which hunts for a set of contacts in signaling condition. As soon a its wipers make connection with such a set of contacts the switch comes to rest and transfers the combination set up to a group of rela s which store up the combination andset tlie distributer into operation to transmit the same. The switch, in the meantime, moves on until it finds another set of contacts in signaling condition, whereupon as soon as the previous combination has been transmitted, the distr-ibuter comes to rest and the new combination is transferred to the storing relays and the operation repeated. By means of this arrangement the si mils are stored up and transmitted in a do nite order. -It will be understood that any equivalent means for securing these results is within the scope of tlfis invention.

In order to translate-the transmitted code combinations into suitable signals for the, proper toll line the invention contemplates the provision of a receivin apparatus which will respond to a particu or combination to set into operation the'signal for a particular line which is represented by that mode combination. The receiving ppartus is herein disclosed as a pyramid re ny conihinntiou of a type well known in the signaling art. but it will be understood that any suitable translating apparatus me" be used for this purpose.

The invention may now drrstood from the when read 'in connection with the act-mnpunying; drawings, Figures 1, 2, 3 and 4 of which. when placed end to end in regular order. constitute a circuitdingrnm of anemliodimont o the invention.

Referring to the-drawing. a long distance toll line L is shown extending between two distant stations. the terminal apparatus at one stationdwing shown in Figs. 1 and 2, and the similar appartus at the other station being shown in F be more fully un- 2 and-4. At the of a toll cord is adapted to cooperate,

following description ,ori inating station. the line terminates in a' serving to connect the called subscriber lineL, terminate -in R adapted to cooperate with a a hug trunk T" wherelfi;

J, of-ia toll switching the-toll line may be: connected to the call subscriber. 'lhe tollcords and switching At the other'station the in. in;

trunks are we'll known in a-rt 'aml are. therefore, not lllustratod in detail.

two-way telegraph transmission. In ordaito transmit group; of (folio signals oval-tho si milling path, a transmitting distributor T?) is provided at one station and a similar ti iiilil'iilfd EFF;rioiiiliinations are reveived at tho two stations by means of receiving distriln tgrs RD' and RD. r0spvoti\'oly. 'lhese distributors ai'fi iniilnr in constructi'onto the distributors used in printing telegraphy and need not ho dosvl'ibed in detail. 1

For tho purpose of translating signals originating with the different linqs into ood'e combinations n K1 in order to Tpi'event the transmission a giifiqreiflfan'nno signal at a timiega'g;ljwbllflnnlto (lli ti niine the orglor in 'which'thusignals shall be transmittvd, ro- "tcli S. common to a group of toll lines; assoriatod'witlg the signalingipath P at tho originating station, a similarswitt'h S being provided. at the other station. T] leso; uvitioh tn tin bijtll i liii-llllyt'l lt"ll i'lwliwg of whichfmees.

my pgiss ovor sots of qodo ('ontaotsiiiniivitlilfll to the various lino and ono"bm slr ofwhibh passes over controlling omitaqtls indiridnal to the line. Each linzein V 1mg m llionth-l ht handmntavt of relayjl l v hi 'InliTn ho into more? 1 they eri: I

, lr i being: shown for pnrtributcr Ill).

vonduotoi' ridin for the 95; are 9,011 piioridod with l a kg-in-lrit froln liaft v wiml ng, .innldl l w L t'o'ni'liianimus, own in Figs. 2mm 3, are assoc-{atoll with tho rvoolvnnr distributors Ill) and RD. The pyramid relays whit'h an of a well known typo arv vontrolltd by relays ll, 22, 33, ll, 55, ()0 and T7, assooiiitdl'l with tho l'l'f0l\lll{, distributor Ill) and a similar out of relays assooiatod with the di Each toll line is provided with two rot-airing: signal conductors, l) and l control lo l by tho pyramidrelays, whereby tl o received signals are transmitted to the proper toll line. -The.pyrnmid relays are arranged to up 1y eitheu grouml or posilirv battery to tie oondurtor l) when si-loctcd, and to apply ground only to the when it is selected, thus proaotuation of three separate owna s. i l

' lho details of the apparatus will now be clear from a descril'ition of the operation, which is as follows: i

Assuming that it iswlosired to establish a (-oniiovtion over tho tol-l line L the operator at tho originating station will insert the lu.; v l of the toll ('ord 'l into tho jack J, 0on1 ploting a i-irouit from batten-fl; through the lamp 12 oror the sleuyoconductors of the pl u;, and jack and thr ngh tli'of I slooro relay 13 to ground. Relay 13 is therelry enorgizodrlult the lamp 1? s not roused to glow whan connected in svrioswitll the resistance 0+ relaylI-l. Relay 13; upon being vnorgizod. at its right hand front conta0twind ingfof' voniplotes a virruit from ground through tho winding of sa an'dli? are, thiai''liy energized and relay l liii" looked upovon a vi'rvnit from lrmu rightlmml oontavt of relay ll-iwvlnil-l toha'ttory. Re ay 17 is looked up over a v through its right halal -ot' the duplex lit-lay 3U upon bcin thereof, over the back right hand contact of rela 23, over the conductor 24, brushes 19. of tie switch S, live code segments corresponding to segment I), and in parallel through the windings of storing relays 1, 2, 3, 4, 5 and 6 to battery. These storin relays are thereby energized and at their is t hand front contacts complete locking circuits through their left hand windings and over the conductor 25, through the winding of relay 23 and over the back contact of relay 26 to ground. Relay 23 is now energized and at its left hand front contact completes a circuit from battery over the conductor 27, over the front right hand contact of relay l7 and front middle contact ofsaid rela throu h its a left hand winding to ground. he left and winding of relay 17 1S difierentially wound with res ect to its other winding so'that the current owing throu hsaid winding causes the .denergization 0 said relay,- thereby opcnin the circuit of the ma net 18 so that the switch S commences rotating to hunt for another signal.

in the meantime storing relays l to 6 inclusive, at their right hand front contacts have connected positive battery to corre sponding segments in the outer ring of the distributer TD and the relay 23 at Its right hand front contact has completed a circuit from ground over the inner ring 20, brush and segment 21 of the distributer TD, front right hand contact of relay 23, through the winding of relay 28, over segment 1, brush and ring 29 to negative battery. Relay 28 is now energized and completes a circuit for the start magnet 30 of the distributor Tl) so that the brusharm is released and is permitted to pass over the segments of thedistributer. Normally the wipers of the brusharm rest upon the segment 1' so that a circuit is completed from positive battery, through the winding of the pole changing relay 31 set and over segment r, brush and ring 251 of thedistfibuter to negative battery. The pole r 1 nging relay 31 is, therefore, normallyenergized so that negative battery is ronnectei to the signaling path P and thipolar rrla 32, associated with the duplex set at the (h tant station, is operated to hold its armat ire on its; live contact, thereby normally uiintaining the relay 39 associated with the 'ereiving distributerRD' energized. As soul as the brush of the distrihuter 'll) passes mm the segment r to the starting segment a, the circuit through the pole changing relay i1 is broken and a positive impulse is sent iverthe signaling path which causes the pol r relay 32 to open the circuit. of the relay 3) at the distant station.

dci nergizcd closes it ('lI'l nit from .ground, 'cgment 34, brush and si-gnn-ntzlfi oi' the row iring distrilmter Ill)", at thidistant station and over the back left hand contact of relay 259 through the wind= transmittin distributor ing station segment T. a

ing of the start magnet 36. '1 he orusharm oft-the receiving distributer RD is now re- 3!: leaIsed and starts to rotfiiteb f 'h n t emeantim t e. us arm 0 1 he;

i *rpin heeainns .10 gins pas'sin overthe s'e ments' 1, 2, 3, 4, 5 and 6 contro ed, by the age 1,] 2, 3, 4, 5 and'fi, which, it will beremefn were locked, up and connected posit1ve,b'at tel-1y to'the distributersegments through, the lt p0 e changing relay 31. As the brusharm rotates over these segments the circuit 'is' closed from negative attery over ring 29,f brush and segments 1, 2, 3, 4, 5 and (has, the case-may be, front right handcontiictsfiu of the corresponding storing relaysen through the winding of the pole chaiiggng f relay 31 to positive battery. Conseg saintly; a succession of six negative impulses ",e. plied to the signalin path, by $18 ,115? 8,6 ('hangin relay 31, t ereby energiiingft e polar re ay 32 at'the distant station #0 com-I plete a circuit forthe relay'39. .Atflihe tune the brusharm of the receiving distrihuter RD is passing over the segment "11' of its in) outer ring, a negative impulse is beinj re ceired from the path P and th e l: e ll1y,39 is thereby energized to i from battery over the front right liaiiiijcon-.. tact .of said rela segment 3 of thefdis-QQQ tribute! RI) am over the brushfanq i ment 11 of said distributer, throng) the windingof relay'll'. Similarly, the. brusharm rotates over. the segnientsggzif, 3f, 7 44'. 55' and 66' circuits arejc'ojnil teu {(30 through the windings of relays il'z zii'f t tflf 55 and 66'. These relaysa're lqqkeil ip g over a circuit from round, back'fc' dwelt of relay 38 and throng the front, riglr iiiiind fl contacts of' relays 11', 22 ',and so mitigat d. through the windings of said" relays togbatt j ter v X circuit is also completed overfth'e right contact of relay. 11' and thjr i winding of the correspondin'g'py} lays 4U. 41, 42 and 43. A similar. 7 a completed over the front right'handfi n,- tact of relay 22' and through the \yh'i'd' g gs 'of relays 45, 46, 47 and '48. A circuit: likewise completed over the contactof re 33', through relaysAS), 50, 51 and}? 1 44' completes a circuit throughthe of relays 53 and M, while relay pletes a circuit for relay 5Q. H 1' y 'hen the arm of the truiisin'ittii'ig distrihq 1' uter TD passes overthc segment '1' o l" the outer ring no rirruit is r -inipleteal'for the pole changing relay 31 asvtlu relay 7 of. the storing relays was not actuated. (tinse quently, ,at the .timethehruslmrm of the receiving disti'ihiitei"7R1?"passes wolf the "po itive,impulseisli ing re-.

' the call may The br harm of the distribute]: TD now passes 'tO iTIG segment 1 and at the same time completes? a circuit from ground over the inner ring 20. brush and segment 57, through the winding of relay 26 to battcry. llelay 26Iopens a circuit of the relay 23 and :the locking circuits of the storing relays which are restored to normal. The relay brusharm passed from the that the circuit of the start magnet was opened and as soon as the brusharm passes from the segment 57 to the segment 21 it engages with the catch controlled by the start magnet and comes to rest The transmitting distributer TD is now ready to transmit a new signal as soon as a new combination is'set'up'.

Returning gain to the receiving distribmiter-RD". the lirusliarm tlicreofin passing from the segment 77' to the segment 57 closes. monu-ntarily, a circuit frrnn ground, back left hand contact of relay 7T segment 58, brush and segment 57 of the distributer RI), front left hand contact of relay 66', front right hand contact of relay 56, front left hand contact of hand contact of relay 5th front right hand contact of relay 46 and front right hand contact of relay 41 to the conductor E, over said conductor, over upper back contact of relay 59 and through the lower winding of said relay to battery. Relay 59 is energizcd over this circuit and a locking circuit is completed from battery through'its lower winding,

upper front contaCt, through its middle winding to ground; At gjs middle,

frontcontact relay 59 closes a circuit from ground over the lower back contact of relay 6U andthrough the guord'lamp 61 80 butmy. The guard lamp 61 now lows to in dicate to the toll operator that t eoriginating operator has connected it calling line to the toll line L and that the connection should now be completed fr he called subscriber. V a

The brusharm of the distributor RD has.

in the ineantimeppassed from segment" 57 to segment 62(thereby-completing"a circuit from ground segment 34. brusliarm and segment 62 of the distributor and through the winding of clear out'relay 38 to battery. llclay 38 upon being energized opens a ljoclting circuitfor the relay 11', 22'. and so forth. which are thereby restored to normal. 'lhesc relays upon dci ncrfiizing open the ays, which ale also restored to normal. 'lhe receiving arrangement is now in mutil tion to receive anothcr signal. V j M V The opcraton npon'lobservi' ng that the lamp (:1 is glowing; inserts-h 1lng-1 .,f into a jack J/ol' a toll so:itchingtrunkT,. wherebc complctcdto the desired llnc. This operation completes a circuitfor 28 was deiinergized as soon as the contuct 21, so

n. a circuit is completed over the circuit prerelay 53, front right lnusharm of the I )ulsc over the the sleeve relay 63 of the trunk,- which complcles a circuit for the relay 60. Relay 60, at its lower front contact, opens the circuit of the guard lamp 61 which is now extinguished. At its middle front contact relay 6U completes a circuit from ground over the low-er back contact of relay (l4 and, lower back contact of relay 65, through the 'winding of relay 6? and over the back contact of said relay to the signaling conductor A, thereby placing a ground potential upon the segment a of the switchs. As soon as the brusharn'i 68 of the switch 5 carries its wipcr (it) into connection with hc segment 80 \iously traced to the segment a, over the brush (it), back left hand contact of relay TU, buck middlc contact of said relay, through the left hand winding of said relay to bat tery. Relays 67 and T0 are energized, relay (37 being lockcl up over its front contact and relay 70 being locked up over its middle front contact and through its middle wind-' ing to ground. clay 70 completes a circuit of a magnet 71, which stops the brusharrn with its brushes 72 resting upon the code segments in the same radial. plane as the segment a. A circuit is now completed from ground over inn er ring 73. brnsharm and segment Tel of distributor TDQover the back left hand. contact. of relay 75 over conduc tor Tllpbl'llSllt-S 72 and the segments upon which they rest. and thence through the left hand windings of relays 1', 2,' 4, 5 and 6' to battery. Thcsc relays upon being energized are locked up in series with relay 7:"). which is thereby cncrgizcd and its front right hand contact completes a circuit from battery. over conductor 75*." front left hand contact of relay 70. front middle contact of 05 said relay and through the right hand wind ing of said relay toground. Relay 70 being differentially wound is de'c'nergizcd by the circuit thus closcd and opens the circuit of magnet 71. thereby iwlinittilig the switch S to bcgin hunting for another signal.

Relay 75 at its left hand front contact completes a circuit from ground over thc inner-ring T3. brush and segment 74 of the distriliutcr Tl over the front left hand contact of rclayi'5. through the winding of relay 79. over segment brush and ring- 80 of thc tllfill'll llltfil' to negative battery. llclay 79 is encrgizcd and closcs a circuit for the start magnct 81. \which releases the distributor Tl Thc ln'usharln in passing from segment 1- to s opcns a circuit of a; pole changing rclay 82. which thereupon sends apositirc inisignaling path l' causing the polarized relay 83 to opcn the circuit of relay '84 which in turn conlplctcs the circuit oft-ho start magnet 85 of the rcccivin'g distributor RDat the originating station.

, The brusharmof said distributor is now the circuit of relay released and rotates over the segments 11, 22, 33, and so forth at the same time that the brusharm of the transmitting distributer TD rotates over the segments 1'. 2'. 3. and so forth. As the brusharm of the distributer Tl) rotates impulses are sent through the pole changing relay 82 for each segment except 7.

changing relay 82 transmits over the path P, a code combination consisting of six nega tive impulses followed by one"'positi\'e unpulse. The'polar relay 83 therefore closes 84 six times as the brusharm of the receiving distributer RD passes circuits for over the segments 11, 22, 33,44, and (36. thereby completing circuits for the relays 11, 22, 33, 44, 5.5 and 66. The transmitting distributor TD" now passes on to the segment 1, causing the pole changing relay 82 to transmit a'fiiiiilnegatire impulse over the si nal path P, ivhich energizes the polar relay 83'to finally close the/circuit of the relay 84, which holds open the circuit or the starting magnet 85. The brusharm of the transmitting distributer TD now engages with the catch controlled by the start magnet Sland comes lo rest.

The relays 1 1, 22, 33, 4:, and (SQ are locked up over their front ontacts and over the back contact of. relay 86 and complete pyramid rela s 87 to 101 inclusive; As theibriils'harin of. the distrihuter a circuit is completed from back right hand Contact 0 ment'lllii, brush and seg I tributer RD; front. light hand contact of relay'66,' left handlfrontfeonta tof relay 101, right hand front contact of relay 99, left hand-f ont contact-of role 96, left land front contacts of relays 92 ant 88 to the conductor E. and ovr saidcontluctor, through the winding of margiiiall relay 194, and thronghdlie windin arro 10.5. to negaltire battery. Belem Q4, is not energized by the currenfisuppliet} from a single. battery, but requires two biittenesdn series in; order that itls'liitllgat'traet is lnot ehergizedh'y the circuit above traced. Belay 1051115013 being energized. attracts its armature's hut-no client is prod uced thereby as a connection is negative battery thr nga a resistance and over the frontj ri ht hand contact of relay 105, right hand contact of rela 106., through the, left -hand windihgfof said relay relay 77,

passes from .77 to segment 7 102, round overthe mer y o ed from.

onsequently, the pole Returning again to the connection com: pleted over the toll switching trunk T as soon as said connection has been completed hya B opr' tor to the jack of the called line, the cal still on his switch across the talking switching trunk in a the art. As soon as Relay 65 upon being energized, at its lower ment .lUZof tlie disits armature and hence.

to the negative pole of the battery It will be seen therefore, that the signal thus transmitted is without any effect at. this time.

n of this particular code The transmissi'o combination, under different circumstances,

"as will "be later pointed out, resu1ts"in a caused to glow,

toll operator at the originating station that 'Dand over the back contact opens 67. which is now restored to normal.

Relay at its upper contact closes a circuit over the lower back contact of relay 107, through the winding of relay 108 and the bark contact of said relay to conductor ll, thereby applying ground potentialto the segment b'of the switch S. As soon as the brush .69 of thev brush arm 68 of the switch 3' rests upon the segment 6, the relay 70 is energized as before to complete a circuit forthe magnet 71, whichstops the switch with its brush 72 resting upon the code seg- ,mentscorresponding to the segment I). This conl pletes. a circuit'for relays 1', 2", 3, 4' ant 5', which are locked up and set the distributeri'ID into operation, as before, to transmit. the resultingcode combination. A code of five positive impulses is now transmitted and the receiving distributor R13 is released, and as it rotates actuates reliWs 11, 22, 33, 44 and 5.5. Theserelays in Ice ingup actuate. the corresponding pyram-i l rqlnysi As the; brusharm of. the distn-rhter RD passes over segments. 10 and 1031 a. momentary mpuls is sent from: ground over-the batik flontact of relay 7 7, segment 103. brush and segment 102 of contact of relay 66, front-contacts: ofrelays 101, 109,; 97 93-and' 89, over-the conductor righthand contact of relay 1061\nd the loft hand winding of said relay tonegative battery. Relay 106 "is energized undlockc l up. by e circuit from negative hattery through' itsleft hand windfront contact andmiddle mg, right hand winding to ground, At its middle contact the locking circuit. of relay.

negative impulses and two the. distributes, back= d subscribers receiver being-10 64 and through the wind-" relay 106 closesa circuit in shuntof the I winding; of the sleeve relay 13 through a' esistance 108 and over themiddle contact of relay lllfi to groan-1.. Thelampmisxnow thereby indicating! to the scriber should now be rung.

The operator, in response to this signal.

and the jack J energizing the ringing relay '09. This eompletes a circuit from ground over-the left hand t'ront contact of relay 14, (which relay. itiwill he remembered was previously-loeked up) oven the lower front eontaet of relay ltll), hark right hand eontaet of relay 110 left hand hark eontaet of sa'i relay and through the right hand \yinding of said relay to hatteryn- Relay 110 is energizedand looked 'a through its right hand and middle wim ings in series. A

circuit is now .eompleted from ground through the left hand winding of relay lit), left hand front eontaet ofsaid relay. right. hand front eontaet of said relay to the eonduetor A therebycount-(ting ground potein tial to the segment a of the switeh S.

As soon as the'hrush 16 ot the hrusharm of said switeh makes eonneetion with said segrnmit. a ('iii'flit is estalilished for the relay !7. whieh hrings the switeh to rest in the manner alreadydescribed. with the lu'usheslfleolitaeting with the live eode segments norresponding to segment o. This eompletes the eireuits For relays l. .2. 3. land 7. whieh are locked up and set the distrihuter TI) into operation to transmit a rude signal of fire negative and two positive impulses. The reeeiving distrihuter lil) is released and in response to the five negative impulses completes eireuits for relays 11, 22, 33" H and These relays in turn energize the corresponding pyramid relays so as the hrusharm passes over segments 57 and 58 a circuit is eompleted from ground. over the. lmek eontaet of relay 7?. over segments ."i8 a-nd 57., over the-hack eontaet of 'relay 66',, front left hand contart of" relay Mi, front right. hand eontaet of relay "it. trout left hand eontaet ot' relays 5L 4? 'and 42 and over the, eonduetor l), through the winding ofaslow release relay lll tofhattery. Relay llL is now energized and eompletes a eireuit from ground over its i myer; front oo'ntaet, lower front eontaet 0 gility -59, (whieln it "will he remembered, w-as'pro vionsly looked up) and thrriugh the winding (lf S'lOW release ringing relay 1l2" to liattery. Relay llil'how applies rmgmgenrrent to tlie ea llod line and at its upper front eontaet rl oses aeirrriit through the upperginding of relay (:4 to maintain said relay energized while ringing current is appliesh .Z When the ealled snhse-riher responds by moving hisreceirebLtronrtho switeli hook, the ilmtterygwhioh had been liridgediaemss the-talking conductors of thetoll switching trunk "P 1 is automatically removed in a manner well nnderstoodinthe art, thereby doiinnrgizingthe relay 64 twhich in :turn opena'a oi'rc njt of-t he relayltifi; A circuit; is e 9a)rlswiiitr a m over the middlc front eontaet of relay 60. lower hack contaets oi relays (i-i and or through the winding of relay 67. over the haekyontaet of said relay to the ronduetor A; thereby applying ground potential to the segment a of the switeh H soon as the hrusharm comes to restupon this segment. eirenits are completed over the,eorresponding rode segments l'or relays l. 2'. Zl 4". 5' and ti. whi h are loeked up and set the distrihuter TD into operation to transmit a eode eom'hination of si\ negi-itiye impulses ail one positive impulse one! the sigi'ialing path l.

The reeeiringidistrihuter RT) at the originating station is released and in response to the six negative in'lpnlses eompletes (ireuits t'or relays ll. '32. 33} H. 55 and '66, whieh are loekeil up and eomplete cireuits as before for the eorresponding pyramid relays. 'hen the lu'usharm, of the dis Hit; a eireuit is eompleted from ground over the haelc eontaet of relay T7. segments 102 and 103. front right hand ,eoutaet of relay titl. front left hand eontaet ot' relay 10L front right hand eontaet of relay 99 and front left hand eonta-etsot' relays 9th 92 and H8 to the eouduetor E. through marginal relay ill-i and through the winding of relay I05. Relay 104 is not energized, but relay 105 is energized and eompletes a circuit fromnegative hattery over its front right hand eontaet and the front light'hand eontact of relaylt tl, whieh had been irovionsly loeked. and through the right ham differential winding of said relayto ground; Belay lift; is thereby detinergized and at its middle eontaet opens. the shunt through the resistagree 108; thereby eausing the lamp 12 to he 'extin uished, indieatiiig to the. toll oporator-1 at the railed suhseriher has "few spond'ed. f

Should therealled suhseriliefldesire to call the attention of the originating operator by (lashing his switch-hook, the relayfiz would he; energized and deenorgized'as tlieswitclt hook ismoved up and doii ngf'l heirelay upon "being first energized would (m ni late the eireuit of slow release't eiaj 565 w ich will remain energized durin' the subsequent ilei m-rgization oi the re ay 64. Conse quen'tl 'y; a series of momentary impulses are transmitted from ground overthe front contaet of relay 6", loweeliaelt Contact of rela (et lowi -r front eon'taetof relay (in, throil the winding of relay 107 tohattery. Raay 1 07 is slow releasing and renmins energised \ehile reeeiving these imeulses; Said rel'a at :its lower eontaet holds open.. the eirc'uitj' of relay-108- aud at itsupper front: contact connect-s ground to the 'eonduetor- (3, thereby code segment "corresponding to segment 0, thereby completing the circuit of relay 7 Min addition" to the relays 1, 2', 3, 4. 5 and r 6; whichfiit-will be remembered, .were enerfi'gized when thebrusharm rested upon the se mam 1r.- Thesc relays are now energized a nil calise thetrans nitting distributer TD y to transmit a code combination ofseven *negati't e impul'scs over. the signaling path a l; which/cause the receiving distributor RD I to transmit impulses to relays 11, 22, 33, 44,

55. 66 :ind 77. These relays are locked up 66, front left hand contact of relay i, "rigllt'iliand contact of relay 99. front left haiR'l-cbhtawt of relays 9G. 92 and 88. and tlieiicewn ei' the cornluctoif through the -ii'i'argiinil relay lllliind throughthe relay 1115 to negatil'e battery." Relay 104 being now included in a' circuit with two batteries in scrig nergizedasis relaylllfv. Relay 195 aft b'i ight hand front contact applies jbattery over the righthand front 'i oi'i'tiict' anilithrough the fright hand differential*winding of relay 10G. thereby deenergizin said relay. Relay 104 at its. front contact completes a circuit from battery throiigli ihe winding of relay 112 to ground.

RelaysIO i-Wunl 105 are'dei nergized as soon a's thei mpulse from the receiving dist ibuter eabsaiid a locking circuit is tln-n compie d' for relay 112. froni ground through 40 as winding. left liand'back contact oi recoarser-hf relay 13' to battery.

lays 105 and 106 and over the left hand iront Relay 11:2 closes-ami'reait from ground through an iiitriiii'ptei illfi and over the front-contact i'ifmla y 112; back, middle contact of relay 10h ahdWhrotigh the resistance 108' to the nsveanaaa; thereby shooting: the sleeve i'efliiyfllh iihd causing the lamp 12 to flash. l 'iie tiriginnting'operator upon observing the fliilhiiig'iif the? lamp 12 may then listen in and repond to the signal ofthe called ns; soon as the called subscriber ceases to fiiisliliis switch'hook, the relay 64: dei ner- 5 gizesj-and remninsdeiiner ized thereby open- I ingfthc circiiitfof relay .5 so that ground is connected thron h the winding of r la'ylj'til' tothe conduc or A and six negatiye impulses are'again transmitted over the sirnaliii an; Pin the receiyin" distribute:-

i i. I h

U R icThedistributei' functions asbefore dew scrlbdtocdmplete a circuit from ground I over the conductor l] and through the marginal relay 104 and ltl'u'ough the winding of impulse transmitted by thedistributer 9 lays.

relay 105 to' negative battery. Relay 1.05 upon bemg encrglzed opens a locking circult of relay 1152. thereby deencrgmng said circuit previously traced so that the lamp 12 is extinguished. I

Returning again to the establishment of the connection with the called subscriber. it will be remembered that the incoming operator in response to the guard lamp 61 inserted the plug P in the jack J. of the toll switching trunk T, so that a B operator could complete the connection with the called subscriber. In case the B operator should find the called subscribers line busy she would then connect the toll switching trunk T to a busy back interrupting circuit whereby the same effect would have been produced as when the called subscriber flashed his switch hook as just described. In other words. battery would be intermittently bridged across the toll switching trunk and the relay 64 would be intermittently energized and dei nergized. This would result in the continuous cnergization of the relay 107. as. before described, thereby applying ground to conductor C so that seven negatire impulses would be transmitted over the sigmaling path P and at the receiving distributor RD positive battery would be connected to the conductor E. to energize marginal relays 1 4 and 105. This results in the intermittent shunting of the relay 13 throiigh the resistance 108, thereby causing the lamp 12 to flash. indicating to the originating toll operator. who has not yet l e-- ceived any ringing signal. that the line is busy.

\Vhen. at the close of the conversation, the originating toll operator receives a discon nect si nal from the called subscriber. the plug 1 will be withdrawn from the jack 1 thereby releasing the relay 13. Relay 13 at its back left hand contact connects ground through the winding of relay 113 and overv the back contact of said relay to the conductor thereby applying ground to the segment c. The switch arm S now comes to rest on this segment thereby completifm circuits through the storing relays i inclusive. Inthis instance. it will be noted. that the relay 7 is energized aqiwell as the other relays. onseqnently. the -'1 st over the signaling path P will be negative so that at the receiving station of Fig. 3. relay 77 will be energized as well as the other re- Accordingly. when the brusharmof the receiving distributer RD passes over the segments 57 and 58 a circuit is completed from negative battery instead of from ground and over the front left hand contact of relay 77', se ments 58 and 57. .front left hand contact of relay 66, front right hand relay. which in turn opens the intcrrupl'iul contact of relay 56, front left hand contact of relay 53, front right hand contact of relays 50, 46 and 41 to the conductor E, over said conductor, and over the up er front contact of relay 59, through the di erential winding .of said relay to rrounrl. Relay 59 is thereby energized and the circuits will be restoredto normal.

It will be seen that by means of this invention a large number of long distance toll lines may have the signals incidental to the establishment of a connection transmitted over the same signaling path without interference. As illustrated, the signaling path will serve for tiventy-eighttolllines since the pyramid circuits will complete twcntyeight different pairs of circuits correspondto conductors D and E. This number may be increased to thirty-two by providing relays 52, 48 and 43 with the same number of contacts as relays 51, 47 and 42. It will be understood, of course, that the capacity of the system may be increased or decreased by increasing or decreasing the number of relays, such as ll-, 22', and so forth.

It will be further understood, with referenee to the pyramid circuit, that while for purposes of illustration certain ofthe relays are shown as having, a large number of contucts, in practice it may be more expedient to provide a large number of relays each having a smaller number of contacts.

in general. it will be obvious that the prin ciples herein disclosed may be, embodied in many other organizations different from that illustrated without departing from the spirit ofthe invention as described in the follmving rlaimm What is claimed is:

1. In a signaling system, a transmission, circuit extending between two stations, a sig nnling path extending between said stations, means responsive to a change in the'condition of said transmission circuit to transmit a code combination over said signaling path and means to translate. the received code, combination into a signal individual to said transmission circuit.

v in a signaling system, a plurality of transmission circuits extending between two stations. a si,' nalin; path rommou to said rim-nits and extending between said stations,

menus responsive to a change in the. eondi tio of one of said circuits to transmita' co e combination characteristic of said ciriurt over snid path and means to translate the received code combination into a signal individual to said transmission circuit.

P from the pack J, the relay 60 will 'e dd- 3. In a signali circuit extending I etween two stations, a signaling path extending between said stations, meansassociated with said vtransmission circuit at one of said stations for originating-a signal, means. responsive to the origination of said si ml to transmit a'code combination over sai path to the other station, and means at the other station to translate said code combination into a signal for said transmission circuit.

4. In a signaling system, a lnrality of transmission circuits extending etween two stations, a signalingpath common to said circuits and extending between said stations, means associatedwith each of said transmission circuits at one of said stations for originating signals, means responsive to the'origination of a signal for transmitting 'a char acteristic code combination over said path to the other station, and means at the other station to translate said code cdmbination other station, means for receiving the transmitted code-combination and for retranslating said combination into a signal for said transmission circuit.

15'. In a signaling system, a plurality of transmission circuits extending between two stations, a signaling path common to said transmission circuits and extending between said stations, means associated with eaclrof said circuits atone of saidstations for originating a signal, means for storing saidsignals, means forsuccessively trans ating the system, a transmissionstored signals into characteristic code combinations, means forsuccessively transmitting-said combinations over the common signal'ing path to the other station, means forreeeiving the, ansmitted combinations, and means for retranslating. the received combinations into signals up ropriate to the transmission circu ts with wliichthey originated. i y

7. In a signaling system, a transmission circuit extending between two stations, a signaling path extendin between said stations, means associated witii said transmission circuit at one of said stations for originating a plurality of signals, means responsive to origination of a signal for storing said signo I means to tr'anslatethe stored s gnals into i-lmrncteristio 'er'rde combinations, means to successively transmit saulronibinations over said signaling path to'the other station,

means for rccciring the transmitted combinations, and means for rctranslating the rcccircd comhinations into signals for said transmission circuit.

8.In a signaling s wtcm. a plurality of transmission circuits extending la-twccn two stations, a signaling path common to said transmission circuits and cxtemling between said stations, means associated with each of said transmission circuits at one of said stations for originating a plurality of signals for each circuit, means for storing said signals, means for successively translating the stored signals into characteristic code combinations, means for successively transmitting said combinations over the common signaling path to the other station, means for receiving the transmitted :omhinations, and means for retranslatingfl the received combinations into a plurality of signals appropriate to the transmission circuits with which they originated. i

9. In a signaling system, a plurality of transmission circuits extending between two stations, a signaling path common to said transmission circuits extending between two stations, means associated with each of said transmission circuits at one of said stations for originating signals, an automatic switch for storing said signal translating them into characteristic code combinations and for determining the order in which they will be transmitted, means to transmit said code combinations over said signaling path to the other station and means for rtranslating the received combinations into signals appropriate to thetransmission circuits with which they originated.

10. In a signaling system, a plurality of transmission circuits extending between two stations, a signaling path common to said circuits and extending between said stations, means associated with each of said transmis sion circuits at one of said stations for origi nating signals, an automatic switch having a set of. contacts corresponding to a signal for each transmission circuit, each set including code determining contacts, means re sponsive to the origination of a signal l y one of said transmission circuits for can ing said. switch to complctc circuits ovcr said code determiningconta ts, means to transmit over said signaling path the codc combination thus determined, and means to translate the transmitted combination into 'saulytransmission lines at one of a signal appropriatito the transmission circuit with which it originated.

11. In a signaling system. a plurality of transmission circuits extending between two stations, a signaling path common to said transmission circuits and extending between said stations, means associated with each of said transmission lines at one of said stations for originating signals. and an inter mittcntly operating distrihnter for transmitting signals originating with any of said transmission circuits over said signaling path to the second station.

12. In a. signaling system, a plurality of transmission circuits extending between two stations, a signaling path common to said transmission circuits and extending between said stations, mcans associated with each oi said stations for originating signals, means for transmitting signals originating with any of said lines over said signaling path to the other station. and an intcriniltcntly operating dis trilnitrr at said otlici' station for appropri aling thc transmitted signals to the transmission circuit with which they originated.

13. In a signaling system, a transmission circuit extending between two stations, a signaling path extending between said stations, means to apply ringing current to said circuit at one of sai stations, means responsive to the applicatiofiol ringing current to said circuit to transmit a code combination ovcr said signaling path'to the second station, and means responsive to said code combination to apply ringing current to a portion of said transmission circuit at said second station.

14. In a signaling system, a plurality of transmission circuits extending between two stations, a signaling path common to Said transmission circuits and extending between said stations, means to apply ringing currcnt to said circuits at one of said stations, mcans responsii e to the application of ring ing current to said circuits to successive] transmit code combinations over said signa lug-path to the second station, and means responsive to said code comhinations to apply rmging current to so id transmission circuits at said second station.

in tcstimony wln-r ol" l have signed my name to this spw'ilication this 9th day of 

